Portable refacing machine



June 12, 1951 MARROTTE 2,556,203

PORTABLE REFACING MACHINE Filed Jan. 5, 1946 3 Sheets-Sheet l FIG. I.

III

INVENTOR N ELSON A MARROTTE ATTORNEY June 12, 1951 I MARROTTE 2,556,203

PORTABLE REFACING MACHINE Filed Jan. 5, 1946 5 Sheets-Sheet 3 w FIG. 6.

a EH1 INVENTOR NELSON A. MARROTTE BY W 6 ATTORNEY latented June 12, .1951

UNITED STATES PATENT OFFICE PORTABLE REFACING MACHINE Nelson A. Marrotte, Dover, N. H. Application January 5, 1946, Serial No. 639,397 (01. 90-12) 1 (Granted under the act of March 3, 1883, as

1 Claim.

amendedA-pril 30, 1928; 370 0.G. 757) This invention relates to a portable refacing machine and more particularly to a device for facing flat oval surfaces, the location of which are not readily accessible for the application of ordinary tools used for this purpose.

In certain types of construction it is often necessary to reface a workpiece such as a door hatch seat which through a welding operation to a structure has become distorted. Often; the structure to which the workpiece has beenwelded is so bulky or unwieldly as to make it impossible to bring the workpiece to a conventional type of refacing machine to reface the distorted surface.

It is an object of the present invention, therefore, to provide a portable refacing machine which may be easily and'readily adjusted to the workpiece to reface the distorted surface.

It is a further object of this invention to provide a device with means for quickly and easily adjusting the refacing tool to the surface that is to be refaced.

A further object of this invention is to provide a device that is operable within a confined location and adjustable means for regulating the depth of cut of the cutting tool during its rotation on the surface to be refaced.

A further feature resides in providing a means whereby the cutting tool can move along a fiat oval surface or a plain circular surface.

These and other objects and novel features of the invention will be more clearly and fully set forth in the following specification and claim.

In the drawings forming a part of this specification: V

Fig. 1 is a top plan view of the portable'refacing machine;

Fig. 2 is a side elevation thereof;

Fig. 3 is a cross sectional view indicated by the line III-III of Fig. 2;

Fig. 4 is a cross sectional view indicated by the line IVIV of Fig. 3;

Fig. 5 is a cross sectional view indicated by the line VV of Fig. 1; V

Fig. 6 is a cross sectional View indicated by the line VIVI of Fig. 3;

Fig. 7 is a cross sectional view indicated by the line VIIVII of Fig. 1;

Fig. 8 is a cross sectional view indicated by the line Vl1IVIII of Fig. 7; and

Fig. 9 is a cross sectional view indicated by the line IXIX of Fig. 1.

In Figs. 2 and 3, the device, generally incli- 1 cated at I0, is shown as applied to a workpiece W. The workpiece W is illustrated as having been welded as at a: to the structure s. During the welding operation it frequently happens that the workpiece W buckles or becomes distorted in such a manner that it is necessary to reface the surface 1.

The surface f is representative of a door hatch seat or a surface that requires precise alignment to insure its proper relationship with some other element. Therefore, it is necessary to reface the surface I to insure proper and true alignment. Since it is often impossible to bring the assembly to a machine where the refacing operation could be performed in the usual manner, other means for refacing the surface must be provided. It is toward the provision of these means that the present invention is directed.

As shown in Figs. 1, 2, 3 and 4, the refacing device l8 includes a carriage generally indicated at l2. The carriage [2 consists, mainly, of two parts, a top member I4 and a bottom U-shaped member 16, the member l6 being secured by screws l8 to the top member M. The top member I4 is adapted to cooperate with a track unit later to be described. A gear 20 is keyed to a drive stub shaft 22 which shaft is journaled in a bearing 24 mounted in the bottom of U-shaped member I6. A compressed air motor M (Fig. 2) is shown attached to the drive shaft 22 as a means of rotating the shaft, but it is to be understood that any type of motor may be used for driving the shaft 22. The gear 20 meshes with a large gear 26 which is keyed, as at 28, to a vertically extending shaft 30. shaft 30 is reduced (Fig. 4) and is journaled in a bearing 32. The bearing 32 is mounted in the lower end of a hollow cylindrical housing 34 which is secured by screws 36 to the bottom face of member 16.

The shaft 30 extends upwardly from the beare ing 32 through a bearing 38 (Fig. 4) in member l6, through an aperture 46 in member l4 and through a lower and upper bearing 42 and 44 respectively. The bearings 42 and 44 are axially positioned within a frusto-conical shaped member 46.

The lower bearing 42 is adapted to ride on an upwardly extending cylindrical boss 48 formed on the top surface of member [4, thereby providing means for allowing the member 48 to rotate with respect to the carriage [2. A horizontally disposed arm 49 extends outwardly from member 46 and the outermost end of arm 49 adjustably supports a tool supporting head unit 52. The tool supporting head unit 52 (Figs. 1 and 5) comprises a housing 54 which carries a pair of axially positioned upper and lower bearings 56 The lower end of and 5B. A vertical shaft 68 is journaled in the bearings 56 and 58 and the lower end of the shaft is threaded so that a refacing tool T can be easily attached thereto.

The drawings illustrate a regular miller cutting tool attached to the shaft 66 but any desirable type of refacing tool may be used. The housing 54 is provided with outwardly extending; flanges 62 and 64 which cooperate with guide members 66 and 68 which members are secured by screws 16 to the arm. 49.

A shaft 12 is shown extending through andjournaled in guide member 68. A pinion gear.14. is keyed to the inner end of shaft 12 and a knurled thumb wheel 16 is keyed to its opposite end.:.. The

pinion gear 14 meshes with a gear rack 18 (Fig.

5) which is secured by screws 86 to thel'rousing- 54, From the foregoing it will, be apparent-that by turnin the knurled wheel 15itheihousing 54 and refacing tool T maybe raised or lowered with respect to the arm 49. Pulleys 82 and 86. (Figs. 4 and 5) are keyed as at 84 and 88m shaftsSil and 66 respectively. A V-belt Silpasses around the pulleys 82 and 86 thereby providing a driving means between the vertically extending shafts 36 and 69. Any suitable drive meansmay be substituted for the V-belt drive herein shown and described.

Referring now to Fig. 4, a worm gear 92 is keyed as at 94 to the lower end of shaft .38'within the housing 34. A worm wheel 98, keyed to a shaft I08, projects through an opening 96 in housing 34 and meshes with the worm gear 92. The shaft Iii-3 is journaled in a bearing I6! (Fig. 3) which bearing is'secured by screws I112 to U- shaped member I6.- A sprocket gear I64 iskeyed to shaft I68 (Figs. 2 and 3) and a chain drive I88 passes around sprocket gear I64-and a second sprocket gear I88. An adjustable idler pulley I81 is provided for taking the slack out of the chain drive I66. The sprocket gear IDS. is freely rotatable on a horizontally disposed shaft I I6 (Figs. 1 and 9) which is journaled in bearings II2 projecting upwardly from the top member I4. A Worm gear H4 is keyed to shaft III) between the bearings H2 (Fig. l). The worm gear II4 meshes with a worm wheel ring I16 which issecured .to the frusto-conical shaped member 46.

A clutch unit (Figs. '1 and 8) generally in-. dicated at II8 is provided as a medium for corr-v trolling the rotation of shaft III) which clutch unit will now be described'in detail. This unit IIS consists of a yoke shaped member I20 pivoted at I22 to a bracket I24 which is attached. to the top member l4by screws I26. A pair of screws I23 are threaded through the armsIZI of yoke member I26 and are adapted to extend into a cylindrical recess 'I3IIin a clutch disc I32. The disc I32 has a frusto-conical'face I34 and the sprocket gear I88 is provided with a cooperating frusto-conical iace-i36. An elongated slot I38 is provided in the shaft I I8 (Fig; 9) through which a pin I46 passes. The pin' I46 is-carried by and riveted to the disc I32. By this construc+ tion, the disc I32and-shaft IIEl are keyed together for rotation and'yetthe disc may be readily moved axially along the shaft.

As-shown in Figs. 1, '7, 8 and 9, an operating hand lever I42 is pivotally mounted on a shaft I44, the shaft being threaded to the-bracket! at one end and having a washer and" nut .at its outer end thus providing a means of preventing the lever I42 to move outwardly with respect to the shaft I44. A spring I46 is-interposed between thezbracket I24 and yoke memberl20, the spring 4. I46 acting to swing the yoke member I28 about the pivot I22. However, a cam surface I48 is provided on one side of the yoke member I26 and the lever I42 engages the cam surface I48 thus limiting outward movement of the yoke member I20. From the foregoing it will be apparent.that when the lever I42 is rocked in a clockwise direction about the shaft I44, the lever I42 will tend to move the yoke member I20 inwardly against the spring I46 by means of the cam surface I48. Therefore, the screws I28 will engage'oneside of the cylindrical recess I38 and will-slide the .disc I32 axially along the shaft IIU bringing the faces I34 and I36 into driving contact. Hence'the' disc I32 and sprocket gear I08 will act as a single unit so that rotation of the sprocket" gear will drive disc I32 which in turn will rotate shaft III). through the pin and slot connection l1i8--I4lli. When the lever I42 is rocked in the ODDOSltGrdlII-JCUOII, i. e., counterclockwise, thespring I42 swings the yoke member I20outWardly thereby causing the inclined'faces I34 andl36'to become disengaged; at this stage, the sprocket'gear can be. rotated without causing any rotation of the shaft III).

As shown in Figs. 2, 3 and 4, the carriage I2 is slidably mounted on a track g'uideway I58 having angle irons I52 attached to both ends thereof. A worm shaft I54'is journaled in bearings I56 and I 58 which are carried by the track guideway, I58- Keyed at one endof the shaft I54 isa hand wheel I66. The wormsh'aft I54 is threaded through block members l62'and I64 (Fig. 4) depending from the under face of memberI 4. By turning the handwh'eel I66, the carriage I2'is moved along the track g-uideway I56; The track guideway. I56 .is secured by mounting bolts I63 passing through slots I 64 in .the angle irons l52 to an adjustable mountingunit generally indicated at I66. With reference to Figs. 3 and 6, the mounting unit I66 comprises a pair of base members- I68 and I'll). The base members I68 and I10 have threaded holes I12 to accommodate the mounting-bolts I63. The pair of shafts I14 and I16-are threaded to the base members I66 and I10, the threads being left and right handed threads so that by turning the shafts I14 and I16 the mounting unit may be lengthened or shortened, lockingnuts I18 are provided to lock the shafts after being adjusted to the correct position within the workpiece W.. A pair of hardened points I86 project from each base member I68 and llfl'which are provided as a means of securely locking the mounting unit I66 to the workpiece W. Set screws I82 are also provided in each base member I63 and I16 to assist in the mounting of the unit I66. From the foregoing it is seen that the mounting unit I66=- may be securely fastened in place to the workpiece W and the track guideway I59 readily attached to the mounting unit.

In operation; the mounting unit I66 is'secured in place to the workpiece'W as described in the foregoing. Following the'track guideway I5!) is secured to the mounting unit I66 by the four bolts I63; Next the tool T is adjusted with respect to surface f which'is to be refaced and the motor M (Fig. 2) which is attached to the drive stub shaft 22 is started. The gear 26 willdrive gear 26 which will rotate-shaft 36; wor-m'gearv 92 and the V-belt pulley 82. The V-belt rotates pulley 86 which in turn rotates shaft 68 and the refacing tool T. As shown in Fig. 6, the device II] can beused for refacing surfaces which are of a'flat oval outline. Thatis, a workpieceW-having-straight parallel sides and semi-circular ends. By turning the handwheel I60 the carriage I2 is moved along the track guideway I513, thus moving the refacing tool '1 along one straight side of the workpiece W. When the tool T approaches one of the semicircular ends of the workpiece W, rotation of the hand-wheel IE9 is stopped and hand lever M2 is rocked downward, or in a clockwise direction, thus engaging the clutch unit H8. Since the shaft 30 is being rotated through gears 20 and 26 the worm gear 92 is likewise being rotated. Such rotation drives worm wheel 98, sprocket gear I84, chain I06 and sprocket gear 38. Since the clutch has been engaged the shaft H0 will be rotated through the medium of the clutch disc I32 and pin Mi Therefore, worm gear I It will rotate to drive the worm wheel ring H6 causing the arm 49 to be swung in an are about the shaft 30. When the refacing tool T has completely traveled around the semi-circular end of the workpiece W the clutch unit H8 is disengaged by moving the hand lever I42 upwardly or in a counter-clockwise direction, thus stopping the rotation of shaft HE and worm gear H 5. Next, the handwheel IE0 is again turned but in an opposite direction to that in which it has just previously been rotated, to move the refacing tool T along the other straight side of the workpiece W until the opposite semi-circular end is reached whereupon the clutch unit H8 is again engaged to move the refacing tool around the semi-circular end, thereby completing the movement of the refacing tool T along the entire flat oval face of workpiece W. The above procedure can be repeated and the tool T adjusted vertically until the desired refacing job is accomplished.

The invention described herein may be manufactured and used by or for the Government of the United States of America for government purposes Without the payment of any royalty thereon or therefor.

Having described my invention, what I claim as novel and desire to protect by Letters Patent of the United States is:

A portable machine for resurfacing the area surrounding an opening comprising an adjustable mounting unit adapted to be secured within said opening, a stationary guide track detachably seccured to said mounting unit, a carriage slidably mounted on said track, a worm shaft journaled in bearings carried by said guide track and threadably engaging a portion of said carriage, means for rotating said worm shaft to move said carriage along said guide track, a tool supporting structure including a supporting arm and means pivotally supporting said arm on said carriage whereby said arm is rotatable about an axis perpendicular. to said guide track, a worm and worm wheel mechanically associated with said pivotally supporting means providing means for rotating said arm about said axis, a driving means, a clutch engageable to couple said driving means to said worm, a tool supporting head carried by said arm at a point removed from said point of pivotal support, a cutting tool mounted in said supporting head and rotatable about a second axis parallel to said first mentioned axis, means for adjusting the position of said tool in a direction parallel to said second axis and means for rotating said tool about said second axis.

NELSON A. MARROTTE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,460,525 Wickland July 3, 1923 2,116,248 Moser May 3, 1938 

